SGER: An Integrated Study of Lower Mississippian (Kinderhookian-Early Osagena) Earth History: Searching for a Link Between Faunal Turnover, Sea-Level Changes and Carbon Cycling

SGER：密西西比河下游（Kinderhookian-Early Osagena）地球历史的综合研究：寻找动物群更替、海平面变化和碳循环之间的联系

• 批准号: 9912385
• 负责人: Matthew Saltzman
• 金额: $ 2.48万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-01 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9912385&HistoricalAwards=false
• 关键词: SGER; Integrated; Study; Lower; Mississippian

9912385Matthew R. Saltzman Carbon isotope data from Mississippian carbonate successions of the western and central United States identifies two of the largest positive excursions of the last half-billion years. The excursions appear to reflect episodes of enhanced organic matter burial, perhaps induced by collisional tectonics and sea level changes. The global nature of the carbon isotope excursions is, however, unproven and the proposed research is focused on characterization of Mississippian seawater carbon isotope values in the western United States (Nevada, Missouri) and western Europe (Belgium). Conodont faunas in these regions that were widely separated in the Mississippian allow for precise intercontinental correlation of marine sedimentary successions. This proposal represents a venture into an emerging research area aimed at understanding causal links between previously documented changes in sea level and glacigenic sedimentation during the Mississippian and changes in carbon cycling indicated by excursions in carbon isotopes. The carbon isotope excursions may also be used as a tool in correlation alongside the established conodont zonation. Previous carbon isotope studies have worked at the stage or formation level of resolution and thus provide limited constraints on the timing of changes in carbon cycling with respect to sea level and faunal turnover.

9912385来自美国西部和中部密西西比碳酸盐岩序列的碳同位素数据确定了过去5亿年来最大的两次正漂移。这些漂移似乎反映了加强有机质埋藏的事件，可能是由碰撞构造和海平面变化引起的。然而，碳同位素漂移的全球性尚未得到证实，拟议的研究重点是美国西部(密苏里州内华达州)和西欧(比利时)的密西西比海水碳同位素值的特征。这些地区的牙形刺动物群在密西西比河相距甚远，因此可以对海洋沉积序列进行精确的洲际对比。这项提议代表着对一个新兴研究领域的冒险，该领域旨在了解之前记录的密西西比河期间海平面和冰川沉积的变化与碳同位素漂移所指示的碳循环变化之间的因果联系。碳同位素漂移也可作为与已建立的牙形刺分带相对比的工具。以前的碳同位素研究是在分解的阶段或形成阶段进行的，因此对碳循环相对于海平面和动物周转的时间变化提供了有限的限制。